Two sisters from Santa Clarita are set to spend the night in Disneyland’s Haunted Mansion in what is believed to be the first time that guests have slept there.

Mark and Brian of 95.5 KLOS announced today that Jessica, 12, and Stephanie Sutton, 10, won a contest to stay inside the attraction. The sisters will be joined by their parents, Cyndi and Tim Sutton, in the mansion on Sunday — the ride’s 40th anniversary.

The Sutton sisters got the most votes on the station’s Web site for their talent: Singing “Happy Birthday” with a dog barking in the background, said Roxane Requio, KLOS manager of marketing and promotions.

“They are excited and can’t wait, and they were just jumping up and down,” Requio said.

Disneyland will keep the ride open as normal Sunday. After the park closes, the Suttons will be allowed to move into the elevator chamber at the entrance of the ride about midnight and stay there until 6 a.m. A live-feed video will be shown on the KLOS Web site.

The mansion’s anniversary coincides with the radio station’s 40th anniversary.